Confident that Eliza had had enough water, Phineas gently picked her up, one arm under her legs and the other behind her head. Holding her carefully, he walked to the edge of the beach and waded into the water. As the waves reached his waist, he look at Eliza, who was barely conscious. 
"The saltwater will clean your wounds. We can't risk them getting infected," he said. "This... may hurt a bit." He lowered her into the water, just enough so that it covered the scars on her waist but her head remained above the water. He stood for a few moments, allowing the disinfectant to sink in. Suddenly, above the gentle lapping of the waves, another sound could be heard. It was distant and faint, and he at first thought he had imagined it, but it gradually grew louder until there was no mistaking it.
It was the distant whine of the engines of a small airship.